/* 初始化css */
* {
    margin: 0;
    padding: 0;
}

a {
    /* 去掉下划线 */
    text-decoration: none;
    color: #363636;
}

ul {
    /* 去掉小圆点 */
    list-style-type: none;
}

em {
    font-style: normal;
}

/* 清除浮动 */
.clearfix::after {
    content: '.';
    display: block;
    height: 0;
    clear: both;
    /* 隐藏并且还存在 */
    visibility: hidden;
}